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Gain model: contrast-dependent gain changes across the population of A1/AAF units. A, The majority of units decreased their gain as contrast was increased, as expected. This is measured here by the radio Gd = dhigh/dlow. B, The larger the contrast-dependent gain of a unit changes, the greater the improvement in model predictive power over the standard LN model. The (nonparametric) Spearman's correlation coefficient between Gd and model improvement was 0.40 (p < 0.001).
